Synthesis and reduction of carbohydrate benzylidene hemithioacetal diastereomers with LiAlH4–AlCl3
Abstract
Reduction of methyl 2-O-benzyl-endo-(11) and -exo-3-O-4-S-benzylidene-4,6-dideoxy-4-thio-α-D-galactopyranoside (12) gives the same S-benzyl derivative (6), but with very different reaction rates, indicating that the configuration of the acetal carbon considerably influences the reactivity of the acetal oxygen atoms.